Analysis

  • max time kernel
    32s
  • max time network
    33s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-08-2024 16:09

General

  • Target

    Bootstrapper.exe

  • Size

    3.1MB

  • MD5

    14b871855a9046ef9aedeec80f9c2d86

  • SHA1

    32c0ad34f524748b76c090fc881b75b928341e7e

  • SHA256

    b14b916cd2f188ea09035489056e0bff9f8cb8e4a30eff50172f86319fabc940

  • SHA512

    7ada8280b9a5a4dcb427da5f7634335c191645614148ed550dbbbacfaed72e1e99202caedddc02f48dc73d96bf0ecd4d35c2ed2d6206e9b25efba4f29dcc8e96

  • SSDEEP

    49152:3v7lL26AaNeWgPhlmVqvMQ7XSKlfyCC4KgoGdulF8THHB72eh2NT:3vhL26AaNeWgPhlmVqkQ7XSKlfyg

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

wefdwef-34180.portmap.host:34180

Mutex

c4be1726-3f86-4f80-bc7c-0779b06ffeeb

Attributes
  • encryption_key

    97BF1FDCF446A7218FA05296FD8D8F0C41A6B1E7

  • install_name

    Bootstrapper.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Spotify

  • subdirectory

    system32

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe
    "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1736
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Spotify" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:3364
    • C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe
      "C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4696
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Spotify" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:3220
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:3144

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Bootstrapper.exe.log

      Filesize

      1KB

      MD5

      baf55b95da4a601229647f25dad12878

      SHA1

      abc16954ebfd213733c4493fc1910164d825cac8

      SHA256

      ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

      SHA512

      24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

    • C:\Users\Admin\AppData\Roaming\system32\Bootstrapper.exe

      Filesize

      3.1MB

      MD5

      14b871855a9046ef9aedeec80f9c2d86

      SHA1

      32c0ad34f524748b76c090fc881b75b928341e7e

      SHA256

      b14b916cd2f188ea09035489056e0bff9f8cb8e4a30eff50172f86319fabc940

      SHA512

      7ada8280b9a5a4dcb427da5f7634335c191645614148ed550dbbbacfaed72e1e99202caedddc02f48dc73d96bf0ecd4d35c2ed2d6206e9b25efba4f29dcc8e96

    • memory/1736-1-0x0000000000CE0000-0x0000000001004000-memory.dmp

      Filesize

      3.1MB

    • memory/1736-0-0x00007FFA9F433000-0x00007FFA9F435000-memory.dmp

      Filesize

      8KB

    • memory/1736-2-0x00007FFA9F430000-0x00007FFA9FEF1000-memory.dmp

      Filesize

      10.8MB

    • memory/1736-10-0x00007FFA9F430000-0x00007FFA9FEF1000-memory.dmp

      Filesize

      10.8MB

    • memory/4696-9-0x00007FFA9F430000-0x00007FFA9FEF1000-memory.dmp

      Filesize

      10.8MB

    • memory/4696-11-0x00007FFA9F430000-0x00007FFA9FEF1000-memory.dmp

      Filesize

      10.8MB

    • memory/4696-12-0x000000001CB00000-0x000000001CB50000-memory.dmp

      Filesize

      320KB

    • memory/4696-13-0x000000001CC10000-0x000000001CCC2000-memory.dmp

      Filesize

      712KB

    • memory/4696-14-0x00007FFA9F430000-0x00007FFA9FEF1000-memory.dmp

      Filesize

      10.8MB